FPCN39 CWLW 131433
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 8:00 AM PDT Sunday 13 July 1997 FOR TODAY.

VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS.
MIXING HEIGHTS IN METRES ABOVE SEA LEVEL.
AVERAGE WINDS IN KNOTS.

SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES.
COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE
TO DETERMINE THE INDEX IN ANY OTHER AREA.

SOUTHERN INTERIOR

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
FRSR CANYN   KEL      28   21     850   3     70   27    1850   5
KAMLOOPS     KEL      34   21    1200   3     92   27    2550   7
OKANAGAN     KEL      30   20    1050   3     91   27    2550   7
CASTLEGAR    SPOK     26   19     800   6    100   27    3500   7
CRANBROOK    SPOK     10   16     950   9     92   22    2850   8
REVELSTOKE   KEL       9   14     450   3     27   19    1000   3

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PENTICTON    VR   5   SW  15   SW  22
CRANBROOK             W    9   W   26

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         2000 m         27 C
SPOKANE          900 m         20 C

TODAY'S VENTING: GENERALLY GOOD.

VENTING FOR MONDAY: GENERALLY GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GENERALLY GOOD.


CENTRAL INTERIOR/NORTHEAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
WILLIAMS L   P.G.    100   17    3950  20    100   23    3950  20
PR. GEORGE   P.G.    100   18    3700  20    100   23    3700  20
SMITHERS     P.G.     25   17     750   8    100   21    3500  18
WELLS GRAY   P.G.    100   18    4000  20    100   22    4000  20
FT NLSN      F.N.    100   23    1250  41    100   27    3400  37
FT STJOHN    F.N.      9   18     700  41    100   23    3700  36

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            W   19   W   28
SMITHERS              SW  17   W   28

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE       800 m         17 C
FT. NELSON       700 m         21 C

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.


COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     61   17     650  12     80   21    1000  12
FRASER VLY   QUIL     59   16     600  12     80   21    1000  12
SRN VRISL    QUIL      9   17     600   0     80   21    1050  12
CNTRL VRISL  QUIL      9   19     700   0     80   22    1050  12
NRN VRISL    HRDY     19   16     250   4     80   17    1050  12
TERRACE      ANT      79   16     900  16    100   19    1450  15
STEWART      ANT      74   17     700  14     94   19    1050  14

*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.

FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    SW  11   SW  20   W   30
PORT HARDY   W   13   SW  15   SW  22
SANDSPIT     SW  24   SW  26   SW  33

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      1700 m         29 C
PORT HARDY       700 m         19 C
ANNETTE          NONE

TODAY'S VENTING: GOOD.

VENTING FOR MONDAY: GOOD.

VENTING OUTLOOK TUESDAY THRU THURSDAY: GOOD.


VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

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